CN115235793A

CN115235793A - Fatigue test equipment

Info

Publication number: CN115235793A
Application number: CN202211166501.8A
Authority: CN
Inventors: 钟浩龙; 孙猛; 杨江林; 徐婷
Original assignee: Ji Hua Laboratory
Current assignee: Ji Hua Laboratory
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2022-10-25
Anticipated expiration: 2042-09-23
Also published as: CN115235793B

Abstract

The utility model relates to a non-pneumatic tire technical field especially relates to a fatigue test equipment, including support, motor shaft, slide rail, restriction piece, test piece, mobile device and route restriction unit. The slide rail is connected to the support, and the motor shaft is connected to the bottom of support, and the motor shaft drive support rotates, and the rotation of support can drive the rotation of slide rail. The limiting part is fixed on the sliding rail and used for fixing the first end of the test piece, the second end of the test piece is connected with the moving device, the moving device comprises a sliding guide part and a path guide part, and the sliding guide part is movably sleeved on the sliding rail. The path limiting unit is an irregular annular track, the moving device rolls along the path limiting unit, and because the path limiting unit is an irregular annular shape, a test piece between the moving device and the limiting piece can be subjected to a tension-compression fatigue test so as to simulate the real road condition of the tire during the work on the road surface and approach the fatigue condition of the actual tire.

Description

Fatigue test equipment

Technical Field

The present disclosure relates to the field of non-pneumatic tire technology, and more particularly, to a fatigue testing apparatus.

Background

At present, the spoke of the non-pneumatic tire mainly uses a traditional tensile fatigue testing machine to carry out tensile and compressive fatigue tests, the traditional tensile fatigue testing machine is mainly divided into an electro-hydraulic fatigue testing machine and an electronic fatigue testing machine, but the two fatigue testing machines have respective defects:

the electro-hydraulic fatigue testing machine is mainly driven by a hydraulic mode, and has a complex structure, heavier device weight and higher cost. Moreover, it is difficult to ensure high frequency and high amplitude simultaneously, for example, when applied to tires, when the parameters are amplitude 10mm and frequency 20HZ, the conventional electro-hydraulic fatigue testing machine is difficult to meet, and the flow rate must be increased, which causes the cost to increase dramatically;

the electronic fatigue testing machine mainly depends on the servo motor shaft and the screw rod, and finishes fatigue action by controlling the positive and negative rotation of the motor shaft, so that the electronic fatigue testing machine is relatively light in equipment weight and low in cost. But the fatigue test frequency cannot be more than 10HZ, and the test requirements on the tire cannot be met.

Disclosure of Invention

In order to solve the technical problem, the present disclosure provides a fatigue test apparatus.

The utility model provides a fatigue test device, which comprises a support, a motor shaft, a slide rail, a limiting piece, a test piece, a moving device and a path limiting unit;

the left side and the right side of the support are respectively provided with a group of first threaded holes, and the support is connected with the slide rail through the first threaded holes;

the bottom of the support is connected with a motor shaft, and the motor shaft drives the support to rotate;

the limiting piece is fixed on the sliding rail and used for fixing the first end of the test piece, and the second end of the test piece is connected with the moving device;

the moving device comprises a sliding guide part and a path guide part, and the sliding guide part is movably sleeved on the periphery of the sliding rail;

the path limiting unit is an irregular annular rail and comprises an inner rail and an outer rail, and the moving device is arranged between the inner rail and the outer rail and can roll along the path limiting unit.

Optionally, the end of the slide rail is connected with a first mounting part, the first mounting part is in the form of a flat plate with uniform thickness, the first mounting part is provided with a set of second threaded holes, the set of first threaded holes is aligned with the set of second threaded holes, and the stud is connected with the second threaded holes through the first threaded holes to form a threaded connection.

Optionally, the restriction piece includes cooperation portion, second installation department and fixed orifices, and cooperation portion is hollow structure, and the slide rail is worn to establish in the cooperation portion, and the fixed orifices is seted up in the both sides of cooperation portion, has seted up the through-hole on the slide rail, and fixed orifices and through-hole align to the bolt can be placed through fixed orifices and through-hole in order to form bolted connection.

Optionally, the second mounting portion is provided with a group of first bolt holes, the moving device further includes a third mounting portion, and the third mounting portion is provided with a group of second bolt holes;

the test piece includes the elastomer, and the both ends of elastomer are connected with a test piece installation department respectively, have seted up a set of third bolt hole on the test piece installation department, and a set of third bolt hole aligns with a set of first bolt hole or a set of second bolt hole to the bolt can be placed through third bolt hole and first bolt hole or second bolt hole in order to form bolted connection.

Alternatively, the path restricting unit is composed of a plurality of columnar bodies arranged at intervals.

Optionally, guide wheels are arranged at positions where the sliding guide parts are in contact with the sliding rail, so that the sliding guide parts move along the sliding rail.

Optionally, positioning holes are further formed in the two sides of the support and the first mounting portion, and the positioning holes are used for aligning the sliding rail and the support.

Alternatively, the path guide portion includes a center roller connected to a bottom side of the slide guide portion, an outer race roller disposed between the center roller and the outer race and freely rolling to freely rotate the outer race with respect to the center roller.

Optionally, the surface roughness Rz of the slide rail is more than or equal to 0.4.

Alternatively, the elastic body and the specimen mounting portion are connected by bonding.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the present disclosure provides a fatigue test apparatus including a support, a motor shaft, a slide rail, a restriction member, a test piece, a moving device, and a path restriction unit. A set of first screw hole has respectively been seted up to the left and right sides of support, and the slide rail is connected through first screw hole to the support. The motor shaft is connected to the bottom of support, and the motor shaft drive support rotates, and the rotation of support can drive the rotation of slide rail. The limiting part is fixed on the sliding rail and used for fixing the first end of the test piece, the second end of the test piece is connected with the moving device, the moving device comprises a sliding guide part and a path guide part, the sliding guide part is movably sleeved on the periphery of the sliding rail, and the moving device can move along the sliding rail. The path limiting unit is an irregular annular rail, the path limiting unit comprises an inner rail and an outer rail, the moving device is arranged between the inner rail and the outer rail and can roll along the path limiting unit, and in the process that the moving device rotates along the path limiting unit, the path limiting unit is in an irregular annular shape for simulating the working condition of the spoke, namely the linear distance between each position of the path limiting unit and the support is different, the moving device can slide on the sliding rail, the distance between the moving device and the limiting piece can also move, further, a tension and compression fatigue test can be carried out on a test piece between the moving device and the limiting piece, so that the real road condition of the tire during working on the road surface can be simulated, and the tire fatigue condition is close to the real tire fatigue condition. Compared with the traditional fatigue test equipment, the fatigue test equipment has the advantages of relatively simple structure and relatively low cost, and can adapt to a larger operation range.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic overall view of a fatigue testing apparatus according to an embodiment of the disclosure;

FIG. 2 is a perspective view of a standoff structure according to an embodiment of the present disclosure;

FIG. 3 is a general schematic view of a motor shaft according to an embodiment of the present disclosure;

FIG. 4 is an overall view of a slide rail according to an embodiment of the disclosure;

FIG. 5 is an overall schematic view of a restraint according to an embodiment of the disclosure;

FIG. 6 is an overall schematic view of a test piece according to an embodiment of the disclosure;

FIG. 7 is a general schematic view of a mobile device according to an embodiment of the disclosure;

FIG. 8 is another perspective view of the mobile device of FIG. 7;

fig. 9 is an overall schematic diagram of a path limiting unit according to an embodiment of the disclosure.

10, a support; 11. a first threaded hole; 12. positioning holes;

20. a motor shaft;

30. a slide rail; 31. a first mounting portion; 32. a second threaded hole;

40. a limiting member; 41. a fitting portion; 42. a second mounting portion; 43. a fixing hole; 44. a first bolt hole;

50. a test piece; 51. an elastomer; 52. a test piece mounting section; 53. a third bolt hole;

60. a mobile device; 61. a slide guide portion; 611. a guide wheel; 62. a path guide section; 621. a central roller; 622. an outer ring roller; 623. an outer ring; 63. a third mounting portion; 64. a second bolt hole;

70. a path limiting unit; 71. a columnar body.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

In order to solve the fatigue test problem of the non-pneumatic tire, the present disclosure provides a fatigue test apparatus including a mount 10, a motor shaft 20, a slide rail 30, a limiting member 40, a test piece 50, a moving device 60, and a path limiting unit 70.

As shown in fig. 1 and 2, a set of first threaded holes 11 are respectively formed in the left side and the right side of the support 10, and the support 10 is connected to the slide rail 30 through the first threaded holes 11. The slide rails 30 are respectively connected to the left side and the right side of the support 10, the bottom of the support 10 is connected with the motor shaft 20, the motor shaft 20 drives the support 10 to rotate, and the support 10 rotates to drive the slide rails 30 thereon to rotate. The slide rail 30 is further provided with a limiting member 40, the limiting member 40 is fixed on the slide rail 30, the limiting member 40 is used for fixing the first end of the test piece 50, and the second end of the test piece 50 is connected with the moving device 60. The test piece in this example is a spoke on a non-pneumatic tire.

Specifically, the surface roughness Rz of the slide rail 30 is not less than 0.4. The surface of the slide rail 30 is coated with a certain amount of grease or lubricant to reduce the friction coefficient thereof and to ensure that the slide rail 30 is not oxidized. The material of the slide rail 30 is preferably Cr40.

As shown in fig. 7, the moving device 60 includes a sliding guide portion 61 and a path guide portion 62, and the sliding guide portion 61 is movably sleeved on the outer periphery of the slide rail 30.

Spokes of a non-pneumatic tire are subject to constant road pressure and rebound during operation. In order to simulate the working conditions of the spokes of the non-pneumatic tire, the path limiting unit 70 is an irregular annular track, the path limiting unit 70 includes an inner track and an outer track, and the moving device 60 is disposed between the inner track and the outer track and can roll along the path limiting unit 70. In the process that the moving device 60 moves along the path limiting unit 70, since the path limiting unit 70 is in an irregular ring shape, that is, the linear distances between the positions of the path limiting unit 70 and the support 10 are not exactly the same, the moving device 60 slides on the slide rails 30, the distance between the moving device 60 and the limiting member 40 is changed, and further, the tensile and compressive fatigue test is performed on the test piece 50 between the moving device 60 and the limiting member 40, so as to simulate the real road condition of the tire during road surface operation, which is close to the real tire fatigue condition. The frequency and amplitude of the tension and compression are determined by both the frequency of the motor shaft 20 and the size of the path limiting unit 70, with the higher the frequency of the motor shaft 20 and the larger the change in the size of the path limiting unit 70, the greater the frequency and amplitude of the tension and compression.

In order to complete the connection of the slide rail 30 and the support 10, as shown in fig. 4, a first mounting part 31 is connected to an end of the slide rail 30, the first mounting part 31 is in the form of a flat plate with a uniform thickness, a set of second threaded holes 32 are opened on the first mounting part 31, a set of first threaded holes 11 is aligned with a set of second threaded holes 32, and a stud passes through the first threaded holes 11 and the second threaded holes 32 to form a threaded connection.

Further, in the present embodiment, positioning holes 12 are further formed on both sides of the support 10 and the first mounting portion 31, and the positioning holes 12 are used for aligning the slide rail 30 with the support 10. After the relative positions of the slide rail 30 and the support 10 are accurately positioned, a positioning pin can be arranged on the positioning hole 12, so that a stud can be conveniently installed in the next step.

In order to limit the position of the test piece 50 in this embodiment, the limiting member 40 includes a fitting portion 41, a second mounting portion 42, and a fixing hole 43, the fitting portion 41 is a hollow structure, the slide rail 30 is inserted into the fitting portion 41, the fixing hole 43 is provided on both sides of the fitting portion 41, a through hole is provided on the slide rail 30, the fixing hole 43 and the through hole are aligned, and a bolt can be placed through the fixing hole 43 and the through hole to form a bolt connection. In use, the fitting portion 41 is first sleeved in the slide rail 30, and when the fitting is performed, the fixing hole 43 on the slide rail 30 and the through hole on the fitting portion 41 need to be aligned, and then the bolt is arranged therein to fix the position of the limiting member 40, so that one end of the test piece 50 can be fixed on the slide rail.

As shown in fig. 5, 6 and 7, in order to fix the test piece 50, a group of first bolt holes 44 is opened on the second mounting portion 42, the moving device 60 further includes a third mounting portion 63, a group of second bolt holes 64 is opened on the third mounting portion 63, the test piece 50 includes an elastic body 51, two ends of the elastic body 51 are respectively connected with one test piece mounting portion 52, a group of third bolt holes 53 is opened on the test piece mounting portion 52, the group of third bolt holes 53 is aligned with the group of first bolt holes 44 or the group of second bolt holes 64, and bolts can be placed through the third bolt holes 53 and the first bolt holes 44 or the second bolt holes 64 to form bolt connection. The first end of the trial 50 can be fixed using the bolt by the engagement of the first bolt hole 44 and the third bolt hole 53, and the second end of the trial 50 can be fixed using the bolt by the engagement of the second bolt hole 64 and the third bolt hole 53, so that the trial 50 can be coupled between the stopper 40 and the moving device 60.

In the present embodiment, the elastic body 51 and the specimen mounting portion 52 are connected by adhesion. The elastic body 51 is formed by integral casting or injection molding and is connected to the specimen mount 52 by bonding so that the specimen 50 is fixed between the moving device 60 and the restricting member 40.

In the present embodiment, as shown in fig. 9, the path restricting unit 70 is composed of a plurality of columnar bodies 71 arranged at intervals. Each column 71 is able to move to achieve the displacement requirements of the test piece 50. The cylindrical bodies 71 are connected with a control system, the movement of the cylindrical bodies 71 can be controlled by the control system, the control system is connected with a computer, firstly, the movement track of each cylindrical body 71 is drawn in computer-aided software, the cylindrical bodies 71 adopt a polar coordinate system, computer programming codes are generated according to the polar coordinate values of the starting point and the end point of each cylindrical body 71, the obtained programming codes control the control system, further, the movement of the cylindrical bodies 71 is controlled, and finally, a target path of the moving device 60 is formed, so that the test piece 50 can complete the displacement work of stretching or compressing according to requirements. Furthermore, the position of each cylinder 71 can be either in place prior to or moved into place during the fatigue test.

In order to smoothly move the moving device 60 on the slide rail 30, guide wheels 611 are provided at positions where the slide guide portion 61 contacts the slide rail 30, so that the slide guide portion 61 moves along the slide rail 30.

Specifically, as shown in fig. 8, in the path guide portion 62, the path guide portion 62 includes a center roller 621, an outer ring roller 622, and an outer ring 623, the center roller 621 is connected to the bottom side of the slide guide portion 61, and the outer ring roller 622 is disposed between the center roller 621 and the outer ring 623 and is free to roll, so that the outer ring 623 is free to rotate relative to the center roller 621. The path guide 62 is disposed between the inner rail and the outer rail of the path limiting unit 70, and during the movement along the path limiting unit 70, the path guide 62 rotates to allow the path guide 62 to smoothly pass through the path limiting unit 70. The path guide 62 is periodically greased or lubricated to reduce friction.

The working process comprises the following steps:

the spokes of a non-pneumatic tire are continuously pressed by the road surface and then rebound during the working process, so that tensile and compressive fatigue is generated. In order to simulate the working condition of the spoke of the non-pneumatic tire, firstly, a target path of the moving device 60 is determined according to the working condition of the actual running of the non-pneumatic tire, and then the position of each cylindrical body 71 in the path limiting unit 70 is determined, then the motor is operated, the motor shaft 20 drives the support 10 connected with the motor shaft to rotate, the support 10 rotates to drive the slide rail 30 connected with the support to rotate, because one end of the test piece 50 arranged on the slide rail 30 is limited by the limiting part 40, the other end of the test piece is connected with the moving device 60, the moving device 60 can slide along the slide rail 30, and the moving device 60 is arranged between the inner rail and the outer rail of the path limiting unit 70 and moves along the path limiting unit 70, namely, during the rotation of the slide rail 30, the moving device 60 can do irregular annular motion along the path limiting unit 70, and further the test piece 50 connected with the moving device 60 can generate a tensile and compression fatigue test.

It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fatigue test device is characterized by comprising a support (10), a motor shaft (20), a slide rail (30), a limiting piece (40), a test piece (50), a moving device (60) and a path limiting unit (70);

a group of first threaded holes (11) are formed in the left side and the right side of the support (10), and the support (10) is connected with the sliding rail (30) through the first threaded holes (11);

the bottom of the support (10) is connected with a motor shaft (20), and the motor shaft (20) drives the support (10) to rotate;

the limiting piece (40) is fixed on the sliding rail (30), the limiting piece (40) is used for fixing a first end of the test piece (50), and a second end of the test piece (50) is connected with the moving device (60);

the moving device (60) comprises a sliding guide part (61) and a path guide part (62), and the sliding guide part (61) is movably sleeved on the periphery of the sliding rail (30);

the path limiting unit (70) is an irregular circular track, the path limiting unit (70) includes an inner track and an outer track, and the moving device (60) is disposed between the inner track and the outer track and can roll along the path limiting unit (70).

2. A fatigue testing apparatus according to claim 1, wherein a first mounting portion (31) is connected to an end of the slide rail (30), the first mounting portion (31) is in the form of a flat plate having a uniform thickness, a set of second threaded holes (32) is opened on the first mounting portion (31), a set of the first threaded holes (11) is aligned with a set of the second threaded holes (32), and a stud is passed through the first threaded holes (11) and the second threaded holes (32) to form a threaded connection.

3. A fatigue testing apparatus according to claim 1, wherein the limiting member (40) comprises a fitting portion (41), a second mounting portion (42) and a fixing hole (43), the fitting portion (41) is a hollow structure, the slide rail (30) is arranged in the fitting portion (41) in a penetrating manner, the fixing hole (43) is arranged on both sides of the fitting portion (41), a through hole is arranged on the slide rail (30), the fixing hole (43) is aligned with the through hole, and a bolt can be placed through the fixing hole (43) and the through hole to form a bolt connection.

4. A fatigue testing apparatus according to claim 3, wherein the second mounting portion (42) defines a set of first bolt holes (44), the moving device (60) further comprises a third mounting portion (63), and the third mounting portion (63) defines a set of second bolt holes (64);

the test piece (50) comprises an elastic body (51), two ends of the elastic body (51) are respectively connected with a test piece mounting part (52), a group of third bolt holes (53) are formed in the test piece mounting part (52), the group of third bolt holes (53) are aligned with the group of first bolt holes (44) or the group of second bolt holes (64), and bolts can be placed through the third bolt holes (53) and the first bolt holes (44) or the second bolt holes (64) to form bolt connection.

5. A fatigue testing apparatus according to claim 1, wherein said path limiting unit (70) is composed of a plurality of columns (71) arranged at intervals.

6. A fatigue testing apparatus according to claim 1, wherein guide wheels (611) are provided at each position where said slide guide portion (61) contacts said slide rail (30) to move said slide guide portion (61) along said slide rail (30).

7. The fatigue testing apparatus according to claim 2, wherein positioning holes (12) are further formed on both sides of the support (10) and the first mounting portion (31), and the positioning holes (12) are used for aligning the slide rail (30) with the support (10).

8. A fatigue testing machine according to claim 1, wherein said path guide portion (62) comprises a center roller (621), an outer ring roller (622) and an outer ring (623), said center roller (621) being connected to a bottom side of said slide guide portion (61), said outer ring roller (622) being disposed between said center roller (621) and said outer ring (623) and freely rolling so that said outer ring (623) freely rotates relative to said center roller (621).

9. A fatigue testing device according to claim 1, wherein the surface roughness Rz of the sliding rail (30) is ≧ 0.4.

10. A fatigue testing device according to claim 4, wherein said elastic body (51) and said specimen mounting portion (52) are connected by adhesion.